sysutils/p5-BackupPC-XS: Update to 0.55

Changes: http://cpansearch.perl.org/src/CBARRATT/BackupPC-XS-0.55/Changes

PR: 219782
Submitted by: Alexander Moisseev <moiseev@mezonplus.ru> (maintainer)
Approved by: garga (mentor)
Differential Revision: https://reviews.freebsd.org/D11052